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Self-organization of Cu–Ag during controlled severe plastic deformation at high temperatures

Published online by Cambridge University Press:  08 June 2015

Salman N. Arshad
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana Champaign, Urbana, Illinois 61801, USA; and Department of Chemistry, Syed Babar Ali School of Science and Engineering, Lahore University of Management Sciences, Lahore 54792, Pakistan
Timothy G. Lach
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana Champaign, Urbana, Illinois 61801, USA
Julia Ivanisenko
Affiliation:
Institute for Nanotechnology, Karlsruhe Institute for Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
Daria Setman
Affiliation:
Department of Physics, University of Vienna, A-1090 Vienna, Austria
Pascal Bellon
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana Champaign, Urbana, Illinois 61801, USA
Shen J. Dillon*
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana Champaign, Urbana, Illinois 61801, USA
Robert S. Averback
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana Champaign, Urbana, Illinois 61801, USA
*
a)Address all correspondence to this author. e-mail: sdillon@illinois.edu
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Abstract

Cu90Ag10 alloys were subjected to severe plastic deformation at temperatures ranging from 25 to 400 °C and strain rates ranging from 0.1 to 6.25 s−1 using high-pressure torsion. The deformed samples were characterized by x-ray diffraction, transmission electron microscopy, and atom-probe tomography. A dynamic competition between shear-induced mixing and thermally activated decomposition led to the self-organization of the Cu–Ag system at length scales varying from a few atomic distances at room temperature to ≈50 nm at 400 °C. Steady-state microstructural length scales were minimally affected by varying the strain rate, although at 400 °C, the grain morphology did depend on strain-rate. Our results show that diffusion below 300 °C is dominated by nonequilibrium vacancies, and by comparison with previous Kinetic Monte Carlo simulations [D. Schwen et al., J. Mater. Res.28, 2687–2693 (2013)], their concentration could be obtained.

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Articles
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Copyright © Materials Research Society 2015 

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References

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